Incubator-alarm.



No. 894,835. PATENTED AUG. 4, 1908.

R. JOHNSON. INGUBATOR ALARM.

APPLICATION FILED FEB. 20, 1907.

FTFH 25 UNITED-- s1.

BpXTENT FICE REBECCA JOHNSON, OF MAXWELL, IOWA.

INCUBATOR-ALARM.

Specification of Letters Patent.

Application filed February 20, 1907. Serial No. 358,482.

Patented. Aug. 4, 1908.

To all whom it may concern: 1 Be it-known that I, REBnooA Jonxsox, acitizen of-the United States, residing at )Iaxwell, in the county ofStory,' State of Iowa, have invented certain new and useful Imrovementsin Incubator-Alarms; and 1 do iereby declare ,the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use theThis invention has relation to electrically operative alarmsforincubators that are sounded when the temperature in the incubatorrises to an undue degree.

The-nature of the invention comprises an s electrical contacting devicesecured to a 'stationary part of the chamber and a verticallv drawingsforming a part of this specification slight modification.

consist primarily of a lamp 1] and means for supported rod provided witha disk adapted to be brought into contact with said contacting device,the said rod being stepped upon a thermostatic expansible bearing and anelectric circuit-comprising a'battery alarm bell, one electrode of saidcircuit being connected with said contacting device and the otherelectrode with the disk on'the rod whereby when the diskisexpandedthrough the medium of undue heat the rod will be raised and its diskbroug in contactwith the first mentioned cont cting device closing.thecircuit and ringingthe alarm. A

Reference is to' be had to the annexed in view of which'the inventionwill first be described-with respect to its construction and mode ofoperation and then bepointed outin the subjoined claims.

Of the said drawingsFigure 1 is a dia- Fig.

with my improvement applied thereto.

ovation, showing a 2 is a detail view, in side e Similar numerals ofreference designate similar parts or features as the case may be,wherever they occur.

I In the drawings, having particular reference to Figs.-1,'2 and 3, 10designates an incubating chamber, which may be of anyordinary'construction for supporting egg-trays and provided with heatingmeans for warming the chamber, which heating means may conveying theheat there roin into pipes l0- catedln water n an overhead tank or othersuit-able means with all of which my invenj preferably beyond the end ofsaid arm.

tion is not directly concerned, and therefore the same not fullyillustrated.

12 designates a bracket having a base, 13,

; by which it may be secured to any stationary part of the chamber,which bracket is rovided with an arm, 14, offset from thease by anangular part, 15, to which latter part is secured the angular base 16 ofa spring finger, 17, which normally extends outward "parallel withthearm 14, but in slightly spaced relationship therefrom, and extends Aset screw 18 is tapped through the arm and bears at its free end againstthe finger 17 so to adjust its position. for a purpose to be presentlyexplained.

19 designates a rod supported vertically in the chamber by a standard26, the lower end of which is secured on the bottom of the incuba'tor,and serves as a support for the thermostatic device, while its upper endis pro vided with a collar 27, forming a guide for the said rod. Thelatter is provided with a disk or collar, 20,.whicli is arranged inproximity to the finger, so that by a slight raising of the rod the diskwill be brought into contact with the fingen' 21 designates anexpansible bearing for the foot of the rod 19 and uponwhichitis stepped.

.The said bearing consists of twoconcavoconvex thermostatic disks 21 and22 secured together at their edges 21. The constructive character of thesaid bearing, (which is of a thermostatic nature), is such that as thedegree of heat increases in the chamber the disks expand in op ositedirections and hence act more quickly and efliciently in raising the rod15 to effect the closing of the circuit, than though the disks wereintegrally connected as a bulb, or than though a devicesubstantiallylike a single diskwere employed.

The finger 17 is made to constitute one of the electrodes of an electriccircuit, by having one end of a wire, 23, connected with its suppbrhsaidWire being a part of the said electric circuit which includes a battery24 and an alarm bell 25, the other electrode being comprised in the disk20 to which the other end of the wire is connected.

In the employment of the invention as thus'far described the finger l7will be adjusted through the medium of the setscrew 18 as near tocontact with the disk as will be necessary, the distance between thedisk 20 and the finger 17 being regulated by a thermade to forin a.contacting point of the elecof the rod 19 ventien.'

nioineter so that when the disk 20 is raised through the medium of therod 19 and itsstep bearing 21 as it will be by increasing the heat inthe chamber, said finger and disk ill be brought together closing theelectric cir- I cuit through the wire .23, it being understood that whenthe circuit is closed the degree of heat in the incubator chamber willbe of such height as to be dangerous to the in ubation of the eggscontained in the cnanil erand 1 hence the alarm bell will be sounded andthe heating means regulated accordingly. Instead of providing thesupport 16 with a contacting der'ice in the form of a spring iinger 17as described, the set screw 18 tapped through the arm 14 as shown inFig. 1 may have the wire 23 connected to it and so be trie circuit. inthis case the disk 20 will be 3 placed on top of the rod 19zllltttlll'tt'tl) below the projecting point of the set sci-en its sothat when the said rod is raised into contact with the said set screwthe circuit will be closed and the alarm bell sounded as in the firstinstance.

It will thus be seen that changes may be. made in the form andarrangement of parts constituting the adjustable electrode with i whichthe disk 20 is adapted to be brought into contact by the expansion ofthe bearing f Without materially departing general nature and spirit ofthe in- T from the i each other,

It is to be understood, of-course, that the invention will be tormcd andarranged in the incubator in a manner and position most available andwhere the devices may be best adapted to perform their functions.

What is claimed is---- The hereimlescribed incuhater-alarm comprising astandard, a thermostatic device carried upon the said standard, the saiddevice consisting of two concavo-convex disks, arranged with their.(wncave surfaces facing a vertical movable rod supported on the upperside of said disks, a guide device, means connecting 1' below the disksand extending around the disks and connected j with the rod above thedisks to guide the rod (lli('zlll the said rod having thereon a sto"consisting ot a round disk forming an electrode. a bracket forattachment to the incn' bator, having a horizontal arm l'orming theother electrode, and an adjusting screw therein to adjust the arm, thebracket normally holding the said other electrode out of contact withthe 'lirst-mentioned electrode, the electrode attached to said rod beingadapted to be brought into contact with the bracket electrode.

in testimony whercol,l alfix my signature, in [H'tstilcc of twowitnesses.

KEBEC IA 'JOI'INSOX. W itnesses O. W. PARKER, H. I. l'louon'ros.

